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RowaPhos is a unique and patented, man made ferric hydroxide material chemically engineered for the efficient removal of phosphates, arsenic and silicates from fresh and salt water, having initially been developed in Germany for treating mains water supplies.

RowaPhos should not be confused with natural materials, which are generally based on aluminium oxide, (zeolite) or even other iron based products which claim to be the same product from other manufacturers.

RowaPhos has the largest absorption ability of any phosphate product worldwide and will not leach back in to the water. This saves the need for immediate removal once the media is exhausted. The product is easy to use and will improve the water quality wherever Phosphate or Silicate is a problem.
It is of interest to Marine and Reef Aquariums where its unrivalled capabilities have shown it to be extremely beneficial in the control of nuisance algae’s and the growth of hard corals.

Constant use of the product is recommended, as its abilities to control nuisance algae is a major benefit.

(the above information was taken directly from the manufacture’s website)

I’ve been using this product for about 5 months in my 90 gallon reef tank. My phosphates dropped from occasionally reading 0.03 ppm to never being detected by my test kit. Also, no nuisance algae in the tank